. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 362 BULLETIN OF THE BUREAU OF Fig. 21.—Obeha bicuspidata Clarke. A. small colony; B. colony showing gono- some. Distribution.—On Pennaria, Eudendrium and gorgonian stems, common; on piles of the United States Bureau of Fisheries wharf, on the piles of the railroad bridge, Bogue Sound lo feet. North River 8 to lofeet. In the colonies found on the Pennaria stems it is possible to find enough variation to cover all the points given as differences between O. bicuspidata and O. bi
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 362 BULLETIN OF THE BUREAU OF Fig. 21.—Obeha bicuspidata Clarke. A. small colony; B. colony showing gono- some. Distribution.—On Pennaria, Eudendrium and gorgonian stems, common; on piles of the United States Bureau of Fisheries wharf, on the piles of the railroad bridge, Bogue Sound lo feet. North River 8 to lofeet. In the colonies found on the Pennaria stems it is possible to find enough variation to cover all the points given as differences between O. bicuspidata and O. bidentaia, in Clarke's descriptions, so that it is hardly possible that there are the two distinct species. The gonosome has not been described hitherto Obelia dichotoma (Linnseus). Serlularia dichotoma Linnscus. Systema Naturae, 1767. p. 131J. Obelia dichotoma Hargitt. American Naturalist, 1901, Nutting, Hy- droids of Woods Hole, 1901, p. 350. Trophosome.—Colony branching, usually in a dichotomous manner, though in the branches this may be quite irregular; two or three annulations on the main stem and branches above each branch and pedicel; pedicels short, annulated throughout or at each end only; hj'drothecae much deeper than wide, with straight sides; margin entire, though in some cases it appears slightly wavy or crenulated. Gonosome.—Gonophores usually borne in the axils of the pedicels, obovate with a distinct collar which narrows from base to tip, somewhat rounded at the end, making a collar quite characteristic; pedicels distinct, with 3 to 6 annulations. Distribution.—On barnacles found growing on the sea buoy. The hydrotheCEe are smaller in these specimens than in those found farther north. Obelia geniculata (Linnseus). Sertularia geniculata Liimaeus, Systema Naturae, 1767, p. 1312. Obelia geniculata Hargitt, American Na- turalist, 1901. p. 382. Nutting, Hy- droids of Woods Hole. 1901, p. 351. Trophosome.—Colony usually con- sisting of a single genicu
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